<!doctype html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport"
        content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
</head>
<body>
<h1>Accept</h1>
<form action="/" method="post" enctype="multipart/form-data">
  <input type="text" name="user">
  <input type="password" name="pwd">
  <input type="file">
  <button type="submit">提价</button>
</form>
<script>
  const form = document.querySelector('form')
  form.addEventListener('submit', e => {
    e.preventDefault()
    const formData = new FormData(form)
    fetch('/', {
      method: 'POST',
      body: formData
    }).then(res => {})
  })
</script>
</body>
</html>
